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Abstract

Airborne laser-induced (and water Raman-normalized) spectral
fluorescence emissions from oceanic chlorophyll were obtained during
variable downwelling irradiance conditions induced by diurnal
variability and patchy clouds. Chlorophyll fluorescence profiles
along geographically repeated inbound and outbound flight track lines,
separated in time by ∼3–6 h and subject to overlying cloud movement,
were found to be identical after corrections made with concurrent
downwelling irradiance measurements. The corrections were
accomplished by a mathematical model containing an exponential of the
ratio of the instantaneous-to-average downwelling
irradiance. Concurrent laser-induced phycoerythrin fluorescence and
chromophoric dissolved organic matter fluorescence were found to be
invariant to downwelling irradiance and thus, along with sea-surface
temperature, established the near constancy of the oceanic surface
layer during the experiment and validated the need for chlorophyll
fluorescence quenching corrections over wide areas of the ocean.

References

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